On the Dependence Between the Process Parameters and the Ribbon Geometry at Chill Block Melt Spinning: Modeling and Experimental Verification

Lubimir Anestiev1
1Institute of Metal Science, Equipment and Technologies with Hydro- and Aerodynamics Centre “Acad. A. Balevski,” Bulgarian Academy of Sciences, Sofia, Bulgaria

Tóm tắt

The influence of process parameters on geometry and the quality of amorphous ribbons produced by the Chill Block Melt Spinning (CBMS) method from, Fe82B18, Fe79.7V2.3B18, Fe77.5V4.5B18 and (Co,Ni,Fe)73(B,Si)27 (in at%) alloys was studied experimentally and theoretically. The assessment of the forces, acting in the melt-substrate contact zone, showed that at CBMS the puddle is shaped by a hydrodynamic mechanism. Thus, by implementing the ideas of the dimensional analysis and solving the equations of heat and momentum transfer, it was possible to obtain a general functional dependency between the process parameters and the geometry of the final product at CBMS (amorphous, or microcrystalline, ribbon). A method for the evaluation from the experimental data of the inherent to the dimensional analysis unknown parameters was developed and tested. The functional dependency was used: (1) to predict the ribbon geometry as a function of the process parameters; (2) to evaluate the cooling rates achieved during the processing of the amorphous ribbons.

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